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[TJ <ubuntu@xxxxxxxxxxx>]

I've starting investigating this issue. The most obvious thing to notice
is that the icedtea6-plugin doesn't create the named pipes in
~/icedteaplugin/ as it should.

That would explain the subsequent failure of the assertion for the gio
write 'channel != NULL'. Obviously the channel is NULL and is presumably
the pipe firefox should be writing to to communicate back to the plugin.

-- 
Jaunty icedtea6-plugin doesn’t work in Firefox 3.5
https://bugs.launchpad.net/bugs/359407
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Status in “firefox-3.5” package in Ubuntu: Confirmed
Status in “openjdk-6” package in Ubuntu: Invalid

Bug description:
On Jaunty amd64 with icedtea6-plugin 6b14-1.4.1-0ubuntu6, Java applets work in Firefox 3.0, but not in Firefox 3.5.  The following messages show up on the console:

$ firefox-3.5
../IcedTeaPlugin.cc:3852: Error: create process
../IcedTeaPlugin.cc:1662: Error: started appletviewer

(firefox-3.5:13746): GLib-CRITICAL **: g_io_channel_write_chars: assertion `channel != NULL' failed
../IcedTeaPlugin.cc:4061: Error: Failed to write bytes to output channel

(firefox-3.5:13746): GLib-CRITICAL **: g_io_channel_flush: assertion `channel != NULL' failed
../IcedTeaPlugin.cc:4075: Error: Failed to flush bytes to output channel

(firefox-3.5:13746): GLib-CRITICAL **: g_io_channel_write_chars: assertion `channel != NULL' failed
../IcedTeaPlugin.cc:4061: Error: Failed to write bytes to output channel

(firefox-3.5:13746): GLib-CRITICAL **: g_io_channel_flush: assertion `channel != NULL' failed
../IcedTeaPlugin.cc:4075: Error: Failed to flush bytes to output channel